Many thanks,
Philipp
2 answers
You need below permission to reset the password
To reset passwords:
Reset User Passwords and Unlock Users
OR
Permission to edit the user via the user interface or the API
Check these permission on the profile.
All the details regarding reset password you can find on below link :
https://help.salesforce.com/articleView?id=resetting_and_expiring_passwords.htm&language=en_US&type=0